Electric radiators - clay core ones

Off topic - does anyone have any experience of electric rads - the clay core ones or the ones with the filament inserted - rather than thh crappy 6 column ones you get in b and q.

Screwfix and other places have then and the price varies from 300-900 quid . they either seem to be clay core or have some sort of electrical element that is inserted from underneath.

I dont want to shell £500 and buy an expensive duff

I’ve got fusion heaters coming soon. They are clay core. I’ll be able to let you know when they are installed but when I put something on the Facebook I did get positive feedback.